Method for the cleaning of the interior of installed conduits

A method of repairing, cleaning and coating the inside of an installed conduit, comprising the steps of:

• drying the inside of a conduit to be coated by flow-through of pre-dried compressed air,
• flowing-through the inside of said conduit a mixture of compressed air and particles of an abrasive medium with a mean exterior diameter of >0.8 mm and a specific weight of >3.0 g cm.sup.-3 in an amount of >1.0 g m.sup.-3, said mixture flowing through said conduit with a mean speed of >10 m s.sup.-1 to remove materials adhering to the inside wall of said conduit,
• cleaning said conduit by flowing-through pre-dried and preheated compressed air until the outside temperature of the line is >40.degree. C. to remove any remaining materials which have been removed from the inside wall of said conduit, and
• subsequently coating the inside of the conduit by means of blowing in and blowing around an adhesive resin by means of compressed air, said adhesive resin being a solvent-free, self-setting resin with at least 5% by weight of inorganic oxidic adhesives with a mean diameter of <0.08 mm.